Loop structures in the July 19, 1999 solar flare

Details Loop structures in the July 19, 1999 solar flare Loop structures in the July 19, 1999 solar flare

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..143k&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

Computer Science

Solar Flares, Magnetic Field

Scientific paper

Comparing the SOHO/EIT 195 Å and Hα images (Hvar and Modra Observatories) with the magnetic field extrapolations of SOHO/MDI magnetograms the loop structures of the July 19, 1999 flare were analyzed. The presence of the current-carrying flux rope was identified by its deviation from the current-free magnetic field extrapolation and "umbrella hand" shape of the Hα ribbons. After the flare start in the neighboring "cone" arcade this current-carrying flux rope interacts (reconnects) with this arcade, forming thus flare loops spanning over both these magnetic structures. During these processes several cross-loop structures appeared. One of them indicates the flare loop interaction. At this space the extended helical structure, possibly a remnant of some current-carrying flux rope, was found. The pitch angle of this helical thread θ = 61° was determined. Assuming then the magnetic field as 10-4 - 10-3T, the total electric current in the helical structure was estimated as J = 4.8×(109 - 1010)A.

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